Roll src/third_party/openscreen/src/ 9fe51a969..3debb43d7 (6 commits)

https://chromium.googlesource.com/openscreen/+log/9fe51a969757..3debb43d7a51

$ git log 9fe51a969..3debb43d7 --date=short --no-merges --format='%ad %ae %s'
2020-01-23 avi Remove a file only needed with an old Mac SDK.
2020-01-22 miu Minor UdpPacket constructors clean-up.
2020-01-22 jophba Add FFMPEG+SDL sysroot image
2020-01-16 jophba Move to using separate Open Screen pantheon bucket
2020-01-22 jophba Issue 102: Make Chromium trybots non-optional
2020-01-17 rwkeane mDNS: Probe Implementation

Created with:
  roll-dep src/third_party/openscreen/src

Change-Id: I8f1e2cd91697287e3dd8ccfd61bda4aca9360f48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017915Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735547}

DEPS

@@ -1269,7 +1269,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/cisco/openh264' + '@' + '6f26bce0b1c4e8ce0e13332f7c0083788def5fdf',
 
   'src/third_party/openscreen/src':
-    Var('chromium_git') + '/openscreen' + '@' + '9fe51a9697573f1d5772e39d4520e478ffd0fb24',
+    Var('chromium_git') + '/openscreen' + '@' + '3debb43d7a51355f9d24a0d7c7d8179667425fc8',
 
   'src/third_party/openxr/src': {
     'url': Var('chromium_git') + '/external/github.com/KhronosGroup/OpenXR-SDK' + '@' + '9e97b73e7dd2bfc07745489d728f6a36665c648f',